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So car is at my Audi dealer for the Brake Assist issue again and have been told they have just released the major update to fix a lot of Q6 problems, update going to be done tomorrow so lets see what happens.

Hi the pressure sensor reads the pressure inside the DPF this also helps with the soot calculation to trigger regeneration, the ECU uses the sensor information to start a regeneration, other contributing factors are EGT sensors, if one of those is playing up it wont regen properly, go back to Carly and see if it will give you a code my money is on one of them being P2002, the adblue delete was not a good idea would it not have been easier just to clean the diffuser nozzle in the exhaust just after the cat easy to get to and only requires a spray bottle and warm water, from experience the A6 is heavy on adblue anyway. Steve.

Towards the rear of the engine , usually,within reach of the dpf.

Have ordered from the Auto Stop Shop who appear to have exactly what I am looking for. They should arrive later this week so fingers crossed. Will keep you posted.

My understanding of pressure switches is they fail and lead you to think a dpf is full at 400% , when it's actually not . You need to scan live data , pressure readings should be as close to zero as possible .

I imagine that if you take that photo into the part dealer you won't need a part name or number.

Look at this thread: https://www.audiownersclub.com/forums/topic/29630-constant-tone-when-engine-started-but-no-dash-warnings/#comment-124249

Did this issue appear after the ad blue delete , it does seem likely to be honest . Dpf and ad blue do talk to one another . Normally dpf regens stop working properly with a poor cheap delete map out. It should regen at around 300 miles afaik. ?